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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
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Cell Signaling Feedback Loops01:07

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Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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A DNA encoding loop program: the snowball effect enhanced microRNA visualization in living cells.

Jian Lv1, Ze-Rui Zhou, Ruo-Can Qian

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A novel DNA encoding loop program strategy enhances microRNA imaging sensitivity. This method uses DNA-programmed gold nanoparticle clustering for ultrafast subcellular visualization.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Nanotechnology

Background:

  • MicroRNA (miRNA) detection is crucial for understanding cellular processes.
  • Current subcellular imaging techniques often lack sufficient sensitivity.
  • Developing ultrasensitive methods for miRNA visualization is a significant challenge.

Purpose of the Study:

  • To introduce a novel DNA encoding loop program (DELP) strategy.
  • To significantly enhance the sensitivity of subcellular microRNA imaging.
  • To provide a universal and convenient assay for miRNA detection.

Main Methods:

  • Utilized a DNA encoding loop program (DELP) strategy.
  • Employed dynamic, ultrafast clustering of plasmonic gold nanoparticles.
  • Leveraged a DNA-programmed recycling process to actuate nanoparticle assembly.

Main Results:

  • Achieved significantly enhanced sensitivity in subcellular microRNA imaging.
  • Demonstrated the effectiveness of the DELP strategy for miRNA visualization.
  • Showcased the dynamic and ultrafast nature of the nanoparticle clustering assay.

Conclusions:

  • The DELP strategy offers a convenient and universal approach for sensitive miRNA detection.
  • This method advances subcellular imaging capabilities for microRNA.
  • The DNA-actuated nanoparticle clustering holds promise for various molecular imaging applications.